From 18.01.2010 we make price drop and some changes on GT server:

SL20 unlock price changed to 2 credits per phone (SL20 RPL button)
SL20 accounts now can be used for all MT Box Nokia related services on GT server
GT server username/password accounts also can be used for SL20 phones

Please note:

Special accounts cant be used for these services
genSX4 prices stay as before 12 credits per phone